Carolyn went on a shopping spree with her Bankamount card and made a purchase totalling $200. If the interest

rate is 1.6% per month on the unpaid balance and she does not pay this debt for 1 year, how much interest will she owe at the end of the year?
please explain how I figure this out

At the end of the year her balance will be:

200*1.016^12 = 241.97.

So she owes 41.97 in interest.

If the 200 is the unpaid balance then she pays 200 x 1.6/100 interest every month
that is 3.2
so next month it is 203.2 x 0.016 which is ??
right now just carry on for 12 months to get the answer but remember to take off the starting 200!